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Diffstat (limited to 'arch/arm/plat-mxc/pwm.c')
-rw-r--r--arch/arm/plat-mxc/pwm.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/arch/arm/plat-mxc/pwm.c b/arch/arm/plat-mxc/pwm.c
index ae34198..5cdbd60 100644
--- a/arch/arm/plat-mxc/pwm.c
+++ b/arch/arm/plat-mxc/pwm.c
@@ -32,6 +32,7 @@
#define MX3_PWMPR 0x10 /* PWM Period Register */
#define MX3_PWMCR_PRESCALER(x) (((x - 1) & 0xFFF) << 4)
#define MX3_PWMCR_CLKSRC_IPG_HIGH (2 << 16)
+#define MX3_PWMCR_CLKSRC_IPG (1 << 16)
#define MX3_PWMCR_EN (1 << 0)
@@ -55,9 +56,11 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
return -EINVAL;
- if (cpu_is_mx27() || cpu_is_mx3()) {
+ if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25()) {
unsigned long long c;
unsigned long period_cycles, duty_cycles, prescale;
+ u32 cr;
+
c = clk_get_rate(pwm->clk);
c = c * period_ns;
do_div(c, 1000000000);
@@ -72,9 +75,15 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
writel(duty_cycles, pwm->mmio_base + MX3_PWMSAR);
writel(period_cycles, pwm->mmio_base + MX3_PWMPR);
- writel(MX3_PWMCR_PRESCALER(prescale - 1) |
- MX3_PWMCR_CLKSRC_IPG_HIGH | MX3_PWMCR_EN,
- pwm->mmio_base + MX3_PWMCR);
+
+ cr = MX3_PWMCR_PRESCALER(prescale) | MX3_PWMCR_EN;
+
+ if (cpu_is_mx25())
+ cr |= MX3_PWMCR_CLKSRC_IPG;
+ else
+ cr |= MX3_PWMCR_CLKSRC_IPG_HIGH;
+
+ writel(cr, pwm->mmio_base + MX3_PWMCR);
} else if (cpu_is_mx1() || cpu_is_mx21()) {
/* The PWM subsystem allows for exact frequencies. However,
* I cannot connect a scope on my device to the PWM line and
@@ -118,6 +127,8 @@ EXPORT_SYMBOL(pwm_enable);
void pwm_disable(struct pwm_device *pwm)
{
+ writel(0, pwm->mmio_base + MX3_PWMCR);
+
if (pwm->clk_enabled) {
clk_disable(pwm->clk);
pwm->clk_enabled = 0;
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